comparing strings

yarons · #1 19-Oct-2004, 06:31

This one seems to be very easy but I'm struggling with this for a few hours now.
I need to comapre 2 strings: one is in a pointer and the other is constant.

When I write strcmp(*str,"hello"); I get teh following warning : different types for formal and actual parameter 1
This reulting in a runtime error.

Any ideas?

Ron

dsmith · #2 19-Oct-2004, 07:42

Quote:

Originally Posted by yarons

This one seems to be very easy but I'm struggling with this for a few hours now.
I need to comapre 2 strings: one is in a pointer and the other is constant.

When I write strcmp(*str,"hello"); I get teh following warning : different types for formal and actual parameter 1
This reulting in a runtime error.

Any ideas?

Ron

Hi Ron. Welcome to GIDForums.

You are passing a char instead of a char* when you write *str.

Try using just strcmp(str,"hello").

yarons · #3 19-Oct-2004, 07:53

How could I not see that???!!!

Thanks

yarons · #4 19-Oct-2004, 07:56

Can I use a switch statement to compare strings e.g.

CPP / C++ / C Code:

switch(str)
{
   case "hello":
     bla bla
     break;


}

??

dsmith · #5 19-Oct-2004, 08:24

Unfortunately no. You either need to string together a bunch of if-else statements or if you are looking for a command parser, you could compare one charecter at a time:

CPP / C++ / C Code:

switch(*command){   //Just look at the first charecter...
  case 'e':
    switch(*(command+1)){  //Look at second charecter...
      case 'n':  //It is possible that this is end as this is the only command that starts with "en"
        call_end_function();
        break;
    }
}

WaltP · #6 19-Oct-2004, 21:50

Quote:

Originally Posted by dsmith

Unfortunately no. You either need to string together a bunch of if-else statements or if you are looking for a command parser, you could compare one charecter at a time:

CPP / C++ / C Code:

switch(*command){   //Just look at the first charecter...
  case 'e':
    switch(*(command+1)){  //Look at second charecter...
      case 'n':  //It is possible that this is end as this is the only command that starts with "en"
        call_end_function();
        break;
    }
}

Ewwwww! Gross!

dsmith · #7 19-Oct-2004, 22:03

Quote:

Originally Posted by WaltP

Ewwwww! Gross!

What? You don't like it? It has its charms...

Your commands could be entered up to only the first unique charecters or the whole command...

Not perfect, but certainly not deserving of your EWWWWW!

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search
Rate This Thread
Rate This Thread:

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Sprintf Multiple Strings	paulicus	C++ Forum	4	02-Aug-2004 14:14
Including Maps and strings??	maddie	C++ Forum	17	05-Jul-2004 07:25
Comparing two arrays	Nelly	C++ Forum	2	16-Jun-2004 05:38
help on comparing structs	nusstu	C Programming Language	4	03-Apr-2004 03:22
How do you compare two strings?	soccer022483	C++ Forum	9	22-Mar-2004 15:45

comparing strings

I think I'm going blind :)

one more thing...